This article is a travel topic
Whitewater sports are the art of bobbing about in a boat, large or small, in moving water. While whitewater kayaking or whitewater canoeing is a solo or duo sport, their close cousin whitewater rafting uses rafts that seat more people. Rafting is more accessible for the casual traveler, as navigation is handled by a professional and even beginners can come along for a white-knuckled ride.
Rapids are graded by class to indicate their rough difficulty level. The practical scale ranges from class I (no skill needed) to class V (experts only), with class VI rapids considered hazardous even to pros. Don't place too much faith on the letter though: difficulty can vary considerably based on the season and the water level, and rivers of one grade may have harder individual rapids that need to be portaged (boat carried) past.
Many operators offer training courses, guided expeditions and short outings. Clubs will also be able to guide you to the best water around.